Signal controlled printing apparatus



Nov. 6,1945. H. 1.. THOLSTRUP SIGNAL CONTROLLED PRINTING APPARATUS FiledDec. 22, 1944 3 Sheets-Sheet 2 INVENTOR /2f .4. 7/7045nez/P ATTORNEY1945. H. LJTHOLSTRUP SIGNAL CONTROLLED PRINTING APPARATUS Filed Dec. 22,1944 3 Sheets-Sheet 5 INVENTOR H. L. Tflazjreu ATTORNEY Patented Nov.6,1945 I t SIGNAL CONTROLLED PRINTING APPARATUS Henry L. Tholstrup,Rochester, N. Y., assignor to International Business MachinesCorporation, New York, N. Y., a corporation of New York ApplicationDecember 22, 1944, Serial No. 569,288

7 Claims. (Cl. 197-74) This invention relates generally to signalcontion may be embodied in a wide variety of differtrolled printingapparatus. ent kinds of signal controlled printing apparatus.

Oneexample of apparatus of the above type is Other objects of theinvention will be pointed 's disclosed in my copnding application SerialNo. out in the following description and claims and 492,896 filed June30, 19 13, and includes. a typeillustrated in the accompanying drawings,which writer which is operated automatically'by signal disclose, by wayof example, the principle of the um'rsp "STATES PATENT OFFICE impulsesproduced as a result of the sensing of code designations previouslyrecorded in a record tape according to a predetermined code system.

This example alsosincludes a cyclically'operable tape reader whichoperates to sense successively the recorded code designationsin the tapeand thereby to control the operation of the typewriter. In practice anydesired message, such as a letter? which it is desired to transcribe,is'firstrecorded in the record tape as codedesignationsreprsentinvention and the best mode, which has been contemplated, ofapplying that principle.

In the drawings:

Fig. 1 is a plan view showing the invention as. embodied in thereader-controlled typewriter disclosed in my copendi lg application,mentioned previously; I Rig. 2 is a view showing a strip of tape inwhich is recorded allot the required character and functional codedesignations of a typical code system ing, respectively, the differentcharacters to be which may be usedtc con o the ppar tus of printed andthe required functional operations of t e pr e d em od ment;

the typewriter. When a tape bearing such a mes- Fig. 3 is an enlargedfragmentary vertical secsage is fed through the reader, the message istional view through the typewriter and showing transcribed on a copysheet in the typewriter in the mechanisms for effecting case shifting;

Fig. 4 is a fragmentary planjview showing the key levers and relatedparts which control the operation of the case shifting mechanism;

Fig. 4a is a fragmentary-vertical section taken the desired finishedform.

/ The character key levers of the typewriter disclosed in said copendingapplication control cor-' responding type bars and the latter carry bothupper and lower. case type. For the purpose of controlling the selectiveprinting, of upper and shift-release key and associated mechanism; and

lower case characters a shift code designation a Wiring ram s wing the Vrio s in the tape operates the shift lever of the type v electrical c ur e c n 0866 S g d writer and the latter-adjusts the typewriter so hif rl se clierationsin response to the sensin that all character codedesignations inthe tape of special ode design ns his r o d p thefollowing the shift code, will provide for printview a showing a ti yerta n parts ing upper case characters. Also, the sensing, of ashift-release code designation in the tape,re turns the typewriter toits normal or lower case condition so that the sensing of subsequentcharacter code designations in the tape will result in the printing ofthe lower case characters.

An object of the present invention is to provide t r a signal controlledprinting apparatus which in-" o Sage, Such s a letter. a e recorded on acludes a new and improved means for effecting c d s p o tape. In Fig. 2,a P n f a automatically case shifting operation in response record t pel 0 i s n and pun d in th tap tospecial code designations, are all ofthe code hole designations which rep- A further object is to provide acase shifting resent. respectively. he characters andthe flincmeans forsignal controlled printing apparatus tio al operations of /thetypewriter which is diswhich is relatively simple in construction andclosed in Pl n in Fig. 1. As shown, the combiwhich is highly effectiveanddependable in operanat ona h le ode system is based 0 six code n Ipositions which are indicated at hot ends of According to one specificaspect of the present e p 0 y the reference numerals I to 6 ininvention,it inay be considered as belng' an imu v Each C n n s ed 11' provementover the ,means for controlling and effecting case shifting whichisembodied in the disclosure ofmy said copeliding application. It h lower[ed e of the tape It. has been Pl ced is noted, however, that in so faras certain of the t e pa t u a er, or e te nction broaderaspects areconcerned, the present invencorresponding to th/gwde'designafion 111 hthe invention, it will be helpful to consider first one practicalexample of a combinational hole each, field bearing the code designationand below on the line 4a-4a of Fig. 4, and illustrating the of thereader and illustrating how the sensing of Before considering in detailthe construction code system by means of which any desired mesverticalcolumn or recording field and opposite as the present invention isconcerned the code designations may be punched in the tape by anysuitable means such, for example, as by the typewriter controlled tapepunch disclosed in my copending application Serial No, 492,895 filedJune 30, 1943.

In Figs, 1, 3, 4, 4a, and of the accompanying drawings, the invention isshown as embodied in a reader controlled typewriter like that shown inmy aforementioned copending application Serial No. 492,896, of whichthis invention, according to a specific aspect thereof, may beconsidered as an improvement. In Fig. 1 the reference numeral |2indicates a cyclically operable tape reader, the numeral l3 indicates atyp writer the operation of which is controlled automatically by tapereading operations of the reader l2, and the character RT indicates acable connection between the reader and typewriter and containing therequired circuit wire connections between electrical devices located inthe two structures.

It is noted that, with the exception of the means provided herein forefiecting and controlling the operation of the case shifting mechanism,the construction and operation of the present apparatus is the same asthat disclosed in my said copending application Serial No. 492,896.Consequently, in view of the complete and detailed disclosure of theelements of the apparatus in the latter application, it is consideredsuperfluous to duplicate herein details of construction which are notessential to an understanding of the present'invention. Reference may behad to such latter application for structural details of the reader,typewriter, and control circuits and devices with which we are notdirectly concerned herein.

As shown in Fig. 1, the tape it] bearing adesired coded message is woundon a supply spool l4 supported by the reader l2. The tape is fed insteps, by means not shown, past a sensing or reading station I5. Astorage spool I6 is provided for receiving the tape after it is read,the latter being rotated by any suitable mechanism (not shown) through afriction drive belt H.

The elements of the reader l2 which function to sense successively thecode designations in the tape are indicated diagrammatically in Fig. 5.These elements include six sensing pins of the group SI to S6,inclusive, which correspond, respectively, to the previously mentionedsix code positions to 6 inclusive in each recording field of the tapeID. The sensing pins are arranged in the same order as the codepositions in Fig. 2 and in a single vertical plane extending at rightangles to the direction of tape movement. The pins are located beneaththe tape H! at the sensing station i5 of Fig. 1, and the tape is fed insteps, by means not shown, past the upper ends of the pins. Thearrangement is such that at the beginning of each reading operation arecord field in the tape is positioned at the sensing station with theupper ends of the pins aligned with their corresponding code positionsin such record field. The pins are suitably guided for verticalmovement, by means not shown, and the lower ends of the pins engage,respectively, the lower spring blades 2ll of pairs of sensing codecontacts of the group Ci to C6 inclusive and which also correspond,respectively, to the six code positions to 6 inclusive.

The spring blades 20 are normally biased to move their related sensingpins upward and to close their related code contacts. Between sensingoperations, the sensing pins S| to S6 are held down below the tape l0,and their related contacts Ci to C6 inclusive thus heldvopen, by a vane21. The vane 2| is formed with an edge 22 fitting within aligned notches23 formed in the pins SI to S6 inclusive, and the vane is rotatablysupported intermediate its ends by a fulcrimi shaft 24 suitably mountedin frame elements (not shown) of the reader. A follower arm 25 dependsfrom the vane 2| and is provided at its lower end with a roller 26engaging a cam 21 fixed to the reader shaft 28. The roller 26 is held inengagement with the cam 21 by a suitabletension spring 29 attached tothe vane 2|.

In Fig. 5, the reader elements are shown in the positions which theyoccupy at the beginning of a reading operation. The-reader shaft isconstantly rotated in a clockwise direction, as indicated by the arrow,by a reader motor which is not shown structural in Fig.5 but isindicated diagrammatically therein by the character RM. When the cam 21moves clockwise from the position shown, the high point of such cam willmove out of engagement with the roller 26. Because the spring 29maintains the roller in contact with the cam, the vane 2| will then.

move clockwise and permit the lower spring blades 20 to move theirrelated pins Si to S6 inclusive upward. In those code positions of thetape where code holes have been punched, therelated sensing pins willpass through such holes andthereby permit sufiicient vertical movementof such pins to provide for the closing of their related code contactsof the group CI to C6 in elusive. Where there is no code hole in a codeposition of the record field at the sensing station, the tape stops theupward movement of the related code pin and thereby prevents the closingof the related code contacts. Continued clockwis movement of the cam 21will cause the roller 26 to be engaged again by the high point of thecam which will result in the vane 2| being moved counterclockwise andthereby moving all of the sensing pins back to the position shown and inthereby opening all of the code contacts. The high point of the cam 21is of substantial length, as shown, so as to provide for spacing thetape by means not shown herein, to bring the next recording field to thesensing station l5 while the sensing pins are held out of the way andthe code contacts held open.

As shown in Fig.- 5, the pairs of code contacts CI to C6 inclusivecontrol, respectively, the energizing of translator relay magnets Ml toM6 inclusive. One contact point of each of the pairs or contacts CI toC6 inclusive is connected by a separate conductor 32 to a positivesupply wire 33 and the other contact point of each of said pairs of codecontacts is connected by a separate conductor 34 to the supply side ofits related translator relay magnet. The return sides of the translatorrelay magnets are all connected by a conductor 35 to a negative supplywire 38. As will be readily appreciated, the supply wires 33 and 36 areconnected, respectively, to the positive and negative sides of anysuitable source (not shown) of direct current supply. Thus, the closingof each of the code contacts, by the passin of its related sensing pinthrough a code hole in the tape at the reading station, results in theenergizing of its related translator relay magnet.

Therelay magnets Ml toMl inclusive are elements of a relay translator ofconventional form indicated in its entirety in Fig. by the numeral 40.As, shown, each relaymagnet controls the transfer of one or morevrelatedrelay transfer contacts. The transfer contacts are each shown in theirnormal or upper position where the upper contact points are closed. Aswill be readily understood, when each of the relay magnets is energizedit transfers its related contacts from such upper position to theirlower or transferred position where their lower contact points areclosed. Consequently, the sensing of the code designations in the tapein the manner explained above, results in selectively closing therelated code contacts singly or in combination and thereby energizingtheir related translator relay magnets and in shifting the transfercontacts of the relays energized from their upper positions shown totheir lower positions. As shown-in Fig. 5,the

relay transfer contacts are connected by suitable conductors in aconventional pyramid or cascade arrangement, and so'that the sensing ofeach code designation provides for the selective adiustmentof thetransfer contacts to condition one circuit path through the elements ofthe relay translator which circuit path corresponds to simplicity allcircuits are shown as being supplied with direct current.

Referring again to Fig.1, it is noted that tho typewriter II is a poweroperated typewriter of well known commercial form and comprises theusual carriage 50 supporting a platen ii for holding the 'copy sheet 52;a keyboard 53 includin the usual character and functional keys; and aplurality 'of'type bars 5! (only one type'bar being shown) supportedwithin a type basket indicated 1 at 56 and, carrying both upper andlower case type 51 and 58, respectively. The. shift key islndicated at59, the shift-lock key at 60, the shift .release key at 8! andtheremaining character and functional keys by the reference numeral 62.

In Fig. 3 a portion 63 of the frame part of the type basket 56 whichsupportsthe type bars, is shown. The type basket ismovably mounted'inthe frame of the machine for case shifting movement in a well known wayand the basket normally occupies an elevated position which is shown.When in such elevated position lower case characters may be typed. Theshift mechthe particular code designation sensed. As disclosed fully inmy said copending application Serial'No. 492,896, each conditionedcircuit path includes a solenoid operatlvely connected to that key leverof the typewriter which controls the printing of the character, or theeffecting of the functional operation, corresponding to i the codedesignation which was sensed and which provided for the selectiveenergization of the relay magnets to condition such circuit path.

As the present invention is concerned primarily.

which operate the character key devers of the typewriter have beenomitted from the drawings anism for drawing the type basket downward topermit the typing of upper case characters is described in U. S. PatentNo. 1,945,097 granted January30, i934, and is, partly shown in Fig. 3.

Secured, respectively,,to the .back of the type basket frame 63 and onopposite sides thereof, are

two brackets 64 (only one being shownin Fig.3)

Each bracket 64 is connected by alink 85 to the outer end of a lever arm66. The lever arms 66 u are fixed respectively, on the ends of atransverse shaft 61 Journaled in the side framework (not shown) of themachine. vlPivoted on a stud I! at one side of the machineis. a lever.69 having two pins 10 and H engageable by the short arms of a T'-shapedlever 12, the later being pivotally mounted zit-l3 on onearm ll of athree-armed lever 15. The lever 69 is connected by a link 16 to .theouter portions of one of the leverarms 66 and at points spaced from theconnection ofsuch as they are considered unnecessary to an'understandingof the present invention. 'Ihecircuit wires at the outlet side of thetranslator gvlrhichi are to be connected, respectively, to these omittedtypewriter solenoids are shown in Fig. 5 as broken off and they areindicated by the rfer-.

ence numeral 43.

After a code designation is sensed and the corresponding circuit paththroughthe translator conditioned in the manner above explainedsuchcircuit path is closed by the closing of contacts 44 by a cam 45 on thereader shaft 28. The con-v tacts connect the positive supply wire 33 tothe input of the translator by means of conductors 46 and 41. The outputcircuit wires of the translator are connected through their relatedtypewriter key operating solenoids with the negathe purposes ofsimplicity the wiring diagram in Fig. 5 is not the same as thatdisclosed in my copending application Serial No. 492,896. Certaincontrol circuits and control devices which have no particular bearing onthe present invention have been omitted. Also, in the interest of .tlvewire 36. At this. point'it is noted-that for arm and its link 65. TheT-lever 12 has a stud l1 projecting into a slot formed in an arm-1Bcomprising anextension ofa shift key lever. 19. -The shiftlever 19 ispivotally supported by a rod.

carried by a stationary frame part BI, and a spring 82 connecting saidlever 19 and frame part II biases said lever '19 to stay in its normallower case position shown in Fig. 3. One farm 83 of lever 15is'connected by a link to a cam unit 85 the. operation of which iscontrolled by movement of the shift key lever 19.

As explained fully in the aforementioned Patent No.1,945,(l97, the camunit 85 comprises a bell crank 81 rotatably mounted on a rod 88 which issuitably supported from the frame of the typewriter by means not shown.The link It is con- .nected to one end of one arm 89 of the bell crank81 anda cam Sliis rotatably mounted on a pin 9| carried by the lowerendof the other arm 92 of the bell crank 81. The cam is. arranged adjacenta power roller 93 which is suitably mounted in the end frame members ofthe typewriter by means not shown and is continually rotated by'thetypewriter motor TM indicated (11-.

agrammatically in Fig. 5. The cam Ell has a pair of lugs 9| and 95projecting laterally therefrom on opposite sides of its rotary supportpin 9|, one or the other of such lugs being enga eable by aspring-pressed arm96'pivoted at 91 on the arm 92 of the bell crank andwhich tends to turn the cam 90 clockwise into engagement with the powerroller. The cam also has a pair of laterally projecting stops 98 and 99arrangedon opposite sides of and at diiferenti distances from the rotarysupport pin 9I and;,adapted to coact with a stop I provided on the lo erend of a lever IOI also pivoted at 91 on the arm 92. The upper end ofthe lever IOI is provided with a laterally projecting stud I02 which isengaged within a slot I03 in the lower'end of an arm I04 depending fromshift key lever I9.

The type basket 56 is shifted downward to upper case position when theshift key lever I9 is depressed. The shift lever I9 may be depressedeither manually by key 59 or 60 or automatically in response to a signalimpulse from the translator, as will be explained more fullyhereinafter. The type basket 56 is returned to its lower case positionwhen the key lever I9 is released so that the latter may move upwardunder the force of its spring 82. It is therefore customary to hold thekey lever 19 depressed while writing upper case characters.

In the illustrated embodiment, when the key lever I9 is depressed, thearm I04, through its slot I03, and the stud I02, rocks the lower endnormal or unlocked position shown by a tension spring II4 connecting thearm H2 and the shift lever I9. An intumed flange IIS on the lever IIOengages the underside of the shift lever I9 when the shift-lock lever H0is in its normal I position and thereby serves as a stop to determinesuch normal position. A detent or latch plate H6 is suitably attached bya screw to a stationary part III of the typewriter frame and coacts withthe hook I I3 to hold or lock, through the lever I I0, the shift leverI9 down in its shifted position When the shift lever I9 is moveddownward to and slightly beyond a point where the'cam 90 is operated toeffect a case shifting operation in the manner previously explained, theshift-lock lever may be moved clockwise about its pivot pin III toengage the hook II3 with the latch plate II6. With the hook in thisposition and when the downward pressure on the shift lever is relieved,the spring '92 acting through the levers 19 and, I I0 will hold the hookin locking engagement with the latch plate H6. The locked position ofarm I I2 is indicated in dotted lines in Fig. 3. As

' beyond the point where case shifting is effected I2 is elevated by thearm 18 to bring one ofthe I short arms of the T-lever to a position atthe left of pin I0. With the shift key lever being depressed,'the cam 90engages the power roller 93 and is turned thereby through one-half arevolution where its stop 90 engages the stop I00 on the arm IOI. Duringthis movement of the cam, the bell crank 81 rocks counterclockwise andthen clockwise and through the link 84 and arm 83 swings the arm I4 oflever I5 forward or to the right. This action moves the T-lever 12forward and the latter due to the position it now occupies engages thepin I0 and swings the lever 69 clock- -wise about its pivot pin 6B.The'lever 69 through.

the link I6 m'oves'theilever arm 66 counterclockwise and throughthe-link 65 pulls the type basket- 56 downward to uppercase position.The parts come to rest while the key lever 19 is held in its depressedor shifted position. When the key lever '19 is released so that it movesupward due to the force of spring 82, the arm I04 thereof rocks thelever arm I M clockwise so that the stop I00 moves out of engagementwith stop 98 and back into the path of lug 99. The spring pressed arm 96again effects operative engagement of the cam 90 with power drivenroller 93. Also, the arm I8 returns the T-lever I2 to the positionshownin Fig. 3. The cam 90 makes another half revolution, during which theT-lever I2 is again moved forward and so that it engages the pin II onthe lever 69 and swings the ilatter counterclockwise about pin 68. Thelink I6 is thus moved to the left as viewed in Fig. 3, which rocks thelever arm 66 clockwise and through the links 65 shifts the type basket56 upward to its normal or lower case position.

In order to hold the key lever I9 down in its shifted position ashift-lock key lever I I0 is provided. As shown in Fig. 3, theshift-lock key lever I I0 is pivotally connected by a pin I I I to theshift lever 19. The shift-lock key 60 is mounted on the lever H0. Thelever IIO includes a downwardly extending arm I I 2 terminating in alocking hook II3, and the lever is urged toward its.

and then. moving the. shift lock key about it's pin I I I to its lockingposition, and then relieving the pressure so that the spring 02 willhold the hook in looking engagement with the plate.

When it is desired to effect manually the return of the shift lever fromthe just described plate I I6.

a downwardly extending projection I30 of shift locked position to itsnormal lower case position, the shift key 59 may be depressed andthereby moved further downward a slight distance so that the hook H3 isseparated from the latch The spring II4 will then return the shift-locklever to its normal or unlocked position. The manual pressure on theshift key 59 can then be released and the spring 82 will return theshift lever and type basket to normal lower case position.

As shown in Figs. 1 and 4 the shift lever I9 with the shift-lock leverpivoted thereto is arranged at the left-hand side of the machine.

A shift-release lever I20 with the shift-release key.

6| mounted thereon is arranged at the right-hand side of the machine.The shift key lever I9 may also be returned from its locked position bymanually depressing the shift-release key BI. To this end, a bail leverI22 is provided which comprises a pair of end plates I23 andI24connected by a bail rod I25 (see Figs. 3, 4, and 4a).v bail lever I22 ismounted for pivotal movement by studs I26 and I2I extending outwardlyfrom the plates I23 and I24, and journaled, respectively, withinopposite sides of the typewriter frame. A stud I28 extends inwardly fromthe end plate I23 and within a notch I29 formed in key lever I9. Asecond stud I3I extends inwardly from the end plate I24 and within anotch I32 formed in a depending extension I33 of shiftrelease lever I20(see Fig. 4a).

When the shift-release lever I20 is moved down either manually bydepressing key 6| or automatically in response to sensing ashift-release code designation as will appear hereinafter,

the extension I33 and stud I 3I rock the bail lever I22 clockwise, asviewed in Figs. 3 and 4a, about its pivotal support and thereby move thestud I28 clockwise, which results in moving the shift lever 10 downwarda short distance beyond its locked position and thereby freeing the hookII3 from plate H6. The spring II4 will then return the lever IIO to itsunlocked position and, when the downward acting force on-the shiftrelease lever I20 is released, the spring 82 will return the shift lever19 and type basket 56 to normal lower case condition.

As shown'in Fig. 3, the shift solenoid H is fixed to a stationarysupport 'plate I40 and includes a vertically movable armature I4Iconnected by a coil spring I42 with the outer end of the shift lever I9.The shift-release solenoid 42 (see Figs. 4 and 4a) is supported in thesame manner and its armature I43 is connected by a similar coil springI44 with the shift release lever I20. When the solenoid M is energizedit moves the shift lever I9 downward to a position where shifting of thetype basket to upper case position is effected in the manner previouslydescribed. Actually, the solenoid 4I moves the shift lever a shortdistance beyond the point where the cam unit 81 is tripped toeffect'case shifting, and

thereby provides for the locking of the shift lever as will presentlyappear. When the shift-release solenoid 42 is energized it moves theshift-release lever I20 downward and, through the stud I3I, plate I24,bail I25, plate I23, and stud I20, moves the shift lever 19 downwardbeyond the position occupied when held locked by the hook H3 and plateII6, so as to effect the releasing of hook I I3 from the latch plate II6, in the manner pre-v viously described.

A shift-lock solenoid I50 is supported by the plate I40 directly beneaththe shift-lock key lever H0. The armature I5I of the solenoid I50 isvertically movable and is connected by a pivot .pin I52 to the lower endof a link I53 the upper end of the latter being in turn pivotallyconnected by a pin I 54 to the lower end of the shiftlock arm II2. Aswill be seen from an examination of Fig. 3, when the shift-lock lever II is in its normal unlocked position, the pivot pin I54 connecting thearm H2 and link I53, is disposed to the right of an imaginary lineconnecting the pivot support pin III of the shift-lock lever and theconnecting pin I52 between the lower end of the link I53 and armatureII. Thusfthe arm H2 and link I53 are in effect the two links of a togglewhich is broken when the shift-lock lever occupies the unlocked positionshown in Fig. 3.

When the solenoid M is energized and thereby moves the shift lever I9downward to and beyond its shifted position as explained above, then theenergizing of the shift-lock solenoid I50 and the resulting downwardvertical movement of In accordance with the present invention,

means is provided for differentially energizing the solenoids M and I50in response to the sen-- sing of a shift code designation in the tapeI0, and in such a manner that the shift lever 19 is first moved downwardto and beyond a point where case shifting is effected and, while in thisposition, the shift-lock lever H2 is moved from the position shown infull lines in Fig. 3 to a locking position where the hook H3 is beneaththe catch plate II6.

From an examination of Fig. 2, it will be noted that the shift codedesignation comprises code holes in code positions I, 2, 4, and 5.Referring to Fig. 5, it will be apparent that the sensing of codepositions I, 2, 4, and 5 energizes translator magnets MI, M2, M4, and M5which shift their respective relay transfer contacts to their lower orshifted position and thereby condition a circuit path which is traced asfollows: from the positive supply wire 33; through the conductor 46; camcontacts 44; conductor 47; transfer contacts MI-I and M2--2, in shiftedposition; transfer contacts M3-4, in the position shown; transfercontacts M4--I and M5-I4, in shifted position; transfer contacts M628,in the position shown; wire I60: and through the shift solenoid 4| andthe coil of a relay I6I, connected in parallel, to the riegative supplywire 36. Thus, upon the subsequent closing of a cam contacts 44 the justtraced circuit is closed thereby and the shift solenoid M and coil ofrelay I6I are energized simultaneously. As explained above, theenergizing of the shift solenoid will result in the shift lever 19 beingdrawn down to and beyond the point where case shifting is effected. Therelay I6I, when energized, closes its contacts I62 and thereby connectsthe shift-lock solenoid I50 across the power source by a circuit tracedas follows: from the supply wire 33, through a conductor I64, contactsI62 now closed, solenoid I50, to the negative supply wire 36. It isnoted that the solenoid 4I and relay I6l are energized simultaneously bythe signal impulse and that solenoid I50 is energized one stepafterwards upon the closing of relay contacts I62. The energizedshift-lock solenoid I50 moves the shift-lock lever IIO to it spreviouslydescribed locking position where the hook member I I3 is beneath thelatch plate H6,

When the contacts 44 are opened by the cam 45 the signal impulse,transmitted through the translator to the shift solenoid M and relayI6I, terminates, thereby simultaneously deenergizing the shift solenoidM and the relay I6I. The relay I6I when deenergized opens its contactsI62 and the circuit through the solenoid I50. Thus, the solenoid I 50 isdeenergized one step after the solenoid M. It is also noted that therelay I6I is a slow acting relay so that its contacts I62 open asubstantial time interval after the solenoid M has become deenergizedsufficiently to release its armature I 4I. As the shift-lock solenoid isheld-energized this short time interval after the deenergizing of theshift solenoid, the hook member II3will be held thereby in its lockingposition beneath the plate II6. Consequently, as the solenoid I50becomes deenergized, the spring 82 will move the shift lever 19 andshift-lock lever IIO upward and thereby effect the previously describedlocking engagement of the hook II3 and'the latch plate H6.

sibility of the hook striking the upper surface of the plate H6 in sucha manner as would pre- 4 tioned, which circuit path also includes theshiftrelease solenoid 42; The conditioned circuit path is traced asfollows: from positivewire 33; conductor 46; cam contacts 44; conductor41; relay transfer contacts MII, M2-2, M3--4, M4-8, and M5-I6 in theirshifted positions; transfer contacts MIi-32, as shown; wire I10; andshiftrelease solenoid 42 to the negative wire 36. As before, whenthecam, contacts 44 close the just traced conditioned circuit path isestablished and shift-release solenoid 42 is energized thereby pullingthe shift-release lever I20 downward The lever I20, through the studI3I, plate I24, bail I25, plate I23, and stud I28 pulls the shift lever19 downward and beyond it locked position in the manner previouslydescribed. This will result in releasing the hook H3 from the plate 6and in the spring II4 moving the shift-lock lever I I about its pivotpin III to its unlocked position; and, when the release signal impulseterminates with the opening of the cam contacts 44, the shift-releasesolenoid 42 becomes deenergized and the spring 82 will return the shiftlever I9 to its normal or lower case position which will result in theshifting of the type basket to normal lower case position, as wasdescribed in detail I hereinabove.

While there have been shown and described and pointed out thefundamental novel features of the invention as applied to a preferredembodiment, it will be understood that various omis-g sions andsubstitutions and changes in the form 1 and details of the deviceillustrated and in its operation may be madeby those skilled in the art,without departing from the spirit of the invention. It is the intention,therefore, to be limited only as indicated by the scope of the followingclaims.

What is claimed is: l

1. In signal controlled printing apparatus of the type wherein caseshifting is effected by the movement of a shift lever against the forceof a spring from a normal position to a second position and wherein saidshift lever is held locked in said second position by a hook pivoted tosaid shift lever and engageable with a stationary latch member, thecombination with said lever, hook, and latch member, of a first magnetoperable when energized to move said shift lever to said secondposition; a second magnet operable when energized to move said hook froman unlobked position to a locking position where it operatively engagessaid latch member when said first magnet is deenergized; means providinga signal impulse; and electrical circuit means including said magnetsand responsive to said signal impulse means for energizing said firstmagnet first and --then energizing said second magnet and fordeenergizing said first magnet first and then deenergizing said secondmagnet.

2. In signal controlled printing apparatus of the type wherein caseshifting is effected by the movement of a shift lever against the forceof a spring from a normal position to a second position and wherein saidshift lever is held locked in said second position by a hook pivoted tosaid shift lever and engageable with a stationary latch member, thecombination with said lever, hook,

and latch member, of a first magnet operable when energized to move saidshift lever to said second position; a second magnet operable whenenergized to move said hook from an unlocked position to a lockingposition where it operatively engages said latch member when said firstmagnet is deenergized; means providing a signal impulse; and electricalcircuit means comprising a first circuit for transmitting said signalimpulse and includin said first magnet and a relay having normally opencontacts, and a secondcircuit connected across a power source andincluding said second magnet and said normally open relay contacts.

3. Signal controlled printing apparatus comprising a case shift levermovable from anormal case position to and beyond a shifted caseposition; a first spring urging said shift lever back to normal caseposition; a stationary latch member; a shift-lock arm pivoted to saidshift lever and including a hook; a second spring urging said arm towardan unlocked position; the construction and arrangement of said shiftlever, arm and latch member being such that with said lever beyond itssaid shifted position, said arm may be rocked to a locking positionwhere, when said shift lever is then returned toward normal position,said hook engages said latch member and is held latched with respectthereto bysaid first spring; a first magnet connected to said shiftlever and operable when energizedto move the latter to and beyond itssaid shifted position; a second magnet connected to said arm andoperable when energized to move the latter to its nal impulse; andelectrical circuit means including said first and second magnets andresponsive to said signal impulse means for differentially energizingand then differentially deenergizing said first and second magnets sothat said first magnet is energized before said second magnet isenergized and is deenergized before said second magnet is deenergized.

4. Signal controlled printing apparatus comprising a case shift levermovable from a normal case position to and beyond a shifted case position;, a first spring urging said shift lever back to normal caseposition; a stationary latch member; a shift-lock arm pivoted to saidshift lever and including a hook; a second spring urging said arm towardan unlocked position; the construction and arrangement of said lever,arm and latch member being such that with said lever beyond its shiftedposition, said arm may be rocked to a locking position where, when saidshift lever is then returned toward normal position, said hook engagessaid latch member and is held latched with respect thereto by said firstspring; a first magnet connected to said shift lever and operable whenenergized to move the latter to and beyond said shifted position; asecond magnet connected to said arm and operable when energized to movethe latter to its said locking position; means providing for a signalimfirst magnet and then to energize said second tion; a first springurging said shift leverback to normal case position; a stationary latchmember; a shift-lock arm pivoted to said shift lever and including ahook; a secondspring urging said arm toward an unlocked position; theconstruction and arrangement of said lever, arm and latch member beingsuch that with said lever beyond its shifted position, said arm may berocked to a locking position where, when said means selectivelyproviding for a shift signal impulse and for a shift;release signalimpulse; electrical circuit mean ncluding said first and secnd magnetsand iresponsive to said impulse pulse; and electrical circuit meanscomprising a first circuit for transmitting said signal impulse andincluding said first magnet and a relay having normally open contacts,and a second circuit connected across a power source and including saidsecond magnet and said normally open relay contacts.

6.;1Siznal controlled printing apparatus comprising a case shift levermovable from a normal case position to andbeyond a shifted case'position; a first spring urging said shift lever back 3.0

to normal case position; a stationary latch member; a shift-Jock armpivoted to said shift lever and including a hook; a second spring urgingsaid arm toward an unlocked position; the construction and arrangementof said lever, arm and '1 latch member being such that with said leverbeyond its shifted position, said arm may be rocked to a lockingposition where, when said shift lever is then returned toward normalposition, said hook engages said latch member and 40 is held latchedwith respect thereto by said first?" spring; a ShlftrIBlGB-SE levermovable from a normal to a release position; means operativelyconnecting said shift-release lever and said shift lever so thatmovement of said shift-release lever to said release position moves saidshift lever beyond its said shifted position; a first magnet connectedto said shift lever and operable whenenergized to move the latter to andbeyond its said second position; a second magnet connected to said armand operable when energized to move the latter to its said lockingposition; .a third magnet connected to said shift-release lever andoperable when energized to move said shift-release lever to its saidrelease position; rimp ilse and second magnets so that said first magnetenergized before said second magnet is energized and is deenergizedbefore said second magnet is deenergized; and a second electricalcircuit means including said thirdm'agnet and responsive to said impulsemeans providing a shift-release signal impulse, for energizing saidthird magnet.

"7. In signal controlled printing apparatus, a case shift lever movabledownward from a normal case position to and beyond a predeterminedshifted case position; a first spring urging said shift lever to returnto said normal case position; a stationary catch plate below said shiftlever; a shift-lock arm pivoted to said shift lever and extendingdownwardly therefrom and including a 'hook so formed that when saidshift lever is beyond said' adjusted position said arm may be roq'kedfrom anunlocked position to a locked position where said hoolawillengage beneath said plate when said shift lever returns toward normalcase position; a second spring urging said arm to, said unlockedposition; a first magnet connected (to said shift lever and operablewhen nergized to move the latter downward and beyond 'said shiftedposition; a second magnet beneath said arm and including an armaturemovable downward when attracted; a link pivoted at one end to the upperend of said armature and extending upwardly therefrom and pivoted at itsupper end to the lower end of said arm; said arm, link, and armaturebeing so arranged that with said arm in unlocked position the pivotbetween said arm and link is at the side of a straight line joining thepivot between said arm and shift lever and the pivot between said linkand armature, which is away from said catch plate, whereby when saidsecond magnet is energized and its armature moves downward said hook isrocked toward said catch plate and into said locked position; meansproviding fora signal impulse; and electrical circuit means includingsaid first and second. magnets and responsive to said signal impulsemeans for differentially energizing and decnergizing said first andsecond-magnets so that said first magnet is energized before said secondmagnet is energized and is deenergized before said second magnet isdeenergized.

HENRY LJ'rHoLsTRUP.

